Emergency switching mechanism



EMERGENCY Filed Ocrc.

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Patented lllay 25, i926.

tsssgzs ANDREW L. MTTE, F NEW' YORK, N. Y., ASSI-DIGR T0 AMERICAN TELEPONE AND TFLEGBFH. GGMEANY, A. CGRPGRATIQN @E T.s'i'IEi! YORK.

EMERGENCY SWTGllNG IVECHANISM.

Application 'ledyctcber 12, 1322. Serial No. 594,1161.,

This invention relates to an emergency switching mechanism '.t'or connnunication systems, and incre particularly to a switching mechanism by which, il' a circuit or part a ot a circuit functions improperly, it will automatically be replaced by a siuiilar supn pleniental circuit. Y

ln one torni of multiplex. tclegraihy, a plurality ot' carrier itreuirenciesare used, lo each beingsuitably modulated with respect to the signal to be transmitted and all ol' them being adapted l'or impression ou asinu gie pair or wires to constitute a plurality ol signaling channels. At anyl one station 1g these` saine carrier l'retucncies may be applied to other wires or pairs ol wires to lrfui nish other signal channels. ln certain recent equipmentl a multiple lrcqucncy generator ot the dynamo type is used lor supn plying the plurality ol carrier frequencies, it being understood that each frequency so generated is led oll in its proper circuits for .signaling purposes.r

ln View ot' the iact that in such a systein all the carrier telegraph circuits terminating in one ollice may be supplied troni' a single multidrequency generator, it will be obvious that it is or' extreme importance not only that reserve equipment be installed but also that means be providcidl whereby, anythingshould go wrong with one such generator, another can be switched into circuit with a ininirnuin of delay. Ehen again, since it is customary' in suchsysteins to limit @e as narrowly as possible by means ot Wave lilters the range o t' trequencies which can enter into any signaling channel, provision must be inade not only 'lor insurance againstl un actual shutdown of one of the genera- 60 tors but also for any change in speed which would be sul'l'icient to shirt the carrier lrequencies with respect to the band' assigned to any given channel.

The specific object of this invention is to provide means'vvhereby a substitution of one generator 'for another may be quickly and automatically made in case one ol the generators goes out of commission or changes its speed substantially or fails in any way to function properly. lt should be understood, however, that the invention has wider applicability than indicated by the special apparatus described, which should be viewed as being for illustrative purposes only, 'the invention will be better under- .stood by reference to the accompanying drawing, in which the ligure shows the switchingmechanism which comprises thisl invention and whereby one generator may be substituted or another. y

liefert-ing more particularly to the ligure, there are shown at LA, La, la, etc., leads coming l'roin a source or' a plurality of carrier oscillations, these leads including, if desired, lilters ot the and pass or other suitable type and leading to the necessary modulating apparatus,transformers, etc., as a preliminary to impression on the'transnnssion line. i

'llie carrier oscillations may be generated by a generator' il, consisting, for example, of a toothed disc ll driven by a motor M1 in iront ol a stator Winding il. As Shovin in the rigore, the Winding f1 is connected to the transmission. line through contacts of the relay la.

is a inulti-frequency generator, Glmay consist or a plurality ot toothed discs 11, lo, il", etc., on one shaft, all driven by the Q .motor lvl and cach giving rise to a different frequency f1, fs, f7, etc., all butithelirst of which may be connected by ineans of contacts ot' relays Se, S7, etc., to the' leads L, L?, etc., each of these leads going tothe signaling circuits which, as stated above, may be a plurality of pairs of Wires, each pair 'of wires constituting,y a plurality of channels and equipped with necessary modulators, tilters and other apparatus.

The motor M., is supplied with power from some power source N1, the leads thereroin including the contacts of a relay R1. l'his relay, under certain circumstances, as will be described later, may be excited by battery B1, and upon such excitation dis- 05 connects the motor M1 from the source N i, Bridged across the winding ,f1 is a circuit containing condenser C, and A. C. relay fr. a u

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series with the relay FL .is 'clny both 0l' thi-15:@ mung unnncciui. lo ,lmllcxfy l inv# i515.; included. in 'the relay JT 'i Q rola conneci'l in su es with. a lmm l l; nwl in- .clude in circuit a" coingnctlnlf the relay A second. .genci'ntor idntirzil with tl e genmalm (.13 and (li-imm by the nimm' Mw is suppliel., nppjinunlul @Quinn cnt.) from tlm .line l in Killing lli@ Cinilincts nl' the relay illu: l, i

lille ciiitui 1S xn A l- A The; 1U windings fl? jm f7,

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ons

pon. Cannes tu rim,

the ni'ninunifs nl' xfelnyfs 13m i4.. commuting the windinggf nl: gener- :itm: H2 -,o 'che lends LG, L .m this Way, :L complete transiti in: nulle fl'n the gener nlm lL withA its n. cinte/(i "pfn-Mus to the Z1 gein: nl' G2 'with its assoc ed :.lpprfLr-zitus, the Wlmle being (lune quickly and automat"- nllyg and the gcnemtm G2 will wm'iflu@ m Operation nnil 'lfuilnl'e on ispart 4:0 func# wie., and thus tion nornmllty. ll; :should lm .ioted *hat 'ilic T5 relay. ilnnil .P2 arf; polar relays su com sin. ictiad that theywill .remain on. @nher pnl@ when cin-rent ceases im llmv.

mcnrlc'd, in order thai; S-

taken. to coi-rect the de'ects which .luis operati Cf@ this en@ provide n locking key A lich :n.ffi'nnily alu-Own to hut Side which c-mlespond 8-5 the gg'eniftor which is rnnnnp. '.llS ley .includes in lis circuit mi nlagm-ievice E @nfl by a *che @they sin is cnnirollei 'further conac on the sido. nl'fcliu relny Jl afmfl, Qn olf the relay J2. fils sllnnfn where the gcnm-atm' ll-1 ko); luckul l@ lle lei. J1 ceases to be excited by aiilue of 'flle genanmn 'L-l, crcni is; closed from battery (annimmt Inlay J1, key ll and. alarm Upon the givinf-Y oni; olf the nlwil th. {o} J- n'un' :now-vrs lll@ y .like .lock it on th@ lign- Side, Unis placing die nlmn'l circuit in Q01 .gliinn tu be upsrnf; .l upon lun?, @l genemtc l: :unl cmresmnlinig Telese@ O' l-U uw@ shown and, describen lie remy i is opferntad @om 'the Wfndnxg 7*'1, 1r, is nppzu'cnt `thai; :my oline? olf ill@ wir :iulgfs of l in its pif mi glio iisl :unl Cornwell" voili; al fnv swam?. gelmini/b..

Galion theirst'. enerator, a relay circuit associated set 'the switching mechanism in operation with an tuned to one of the frequencies of for the purpose' escribed. the first generator and 'acting to close cir- In testimony whereof, I have signed my 10 cuits whereby lthe generated oscillations are name to this s peciiication this 6th day of l impressed on their respective work circuits, October 1922.

said relay being adpted upon departure of the first generator from normal operation to ANDREW L. MATTE. 

